Dell PowerVault, Manual, Page: 59 / 396

Creating A Consistency Group
A consistency group contains simultaneous snapshots of multiple virtual disks to ensure consistent
copies of a group of virtual disks. When you add a virtual disk to a consistency group, the system
automatically creates a new snapshot group that corresponds to this member virtual disk.
The following command creates a new, empty consistency group. You must add the snapshot groups
using the
set consistencyGroup addCGMember
command.
create consistencyGroup userLabel=" consistencyGroupName "
[repositoryFullPolicy=(failBaseWrites | purgeSnapImages) |
repositoryFullLimit=percentValue | autoDeleteLimit=numberOfSnapImages |
enableSchedule=(TRUE | FALSE) | schedule (immediate | snapSchedule) |
rollbackPriority=(lowest | low | medium | high | highest)]
where
userLabel
is the name of the new consistency group you want to create.
repositoryFullPolicy
controls how you want snapshot processing to continue if the snapshot
repository virtual disks are full. You can choose to fail writes to the base virtual disk (
failBaseWrites
) or
delete the snapshot images (
purgeSnapImages
). The default action is to delete the snapshot images.
The
repositoryFullLimit
parameter controls the percentage of repository capacity at which you
receive a warning that the snapshot repository virtual disk is nearing full. Use integer values.
autoDeleteLimit
configures the automatic deletion thresholds of snapshot images to keep the total
number of snapshot images in the snapshot group at or below a designated level. When this option is
enabled, then any time a new snapshot image is created in the snapshot group, the system automatically
deletes the oldest snapshot image in the group to comply with the limit value. This action frees repository
capacity so it can be used to satisfy ongoing copy-on-write requirements for the remaining snapshot
images.
For other values, see
Create Consistency Group .
Deleting A Consistency Group
This command deletes a snapshot consistency group. You can either delete both the consistency group
and the repository virtual disks contained by the consistency group, or you can delete only the
consistency group and leave the repository virtual disks contained in the consistency group intact.
delete consistencyGroup [ consistencyGroupName [deleteRepositoryMembers=(TRUE |
FALSE)]]
To delete the consistency group and the repository virtual disks, set the
deleteRepositoryMembers
parameter to
TRUE
. To retain the repository virtual disks, set this parameter to
FALSE
. The default setting
is
FALSE
.
Once completed, this command:
• Deletes all existing snapshot images and snapshot virtual disks from the consistency group.
• Deletes all the associated snapshot images and snapshot virtual disks for each member virtual disk in
the consistency group.
• Deletes all associated repositories for each member virtual disk in the consistency group (if selected).
Setting Consistency Group Attributes
To change or set the properties for a snapshot consistency group, use the
set consistencyGroup
command:
set consistencyGroup [" consistencyGroupName "] [userLabel=" consistencyGroupName "
| repositoryFullPolicy=(failBaseWrites | purgeSnapImages)|
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